Friction-buffer.



.TOSIAH NICHOLS, OF LIMA, OHIO.

FRICTION-BUFFER.

Specification of Letters Patent.

Patented Sept. 3, 1907.

ippucason ned october 11,1906. sesamo. 338,468

To-all ivhom it may concern:

Be it known that I, .losIAH NICHOLS, a citizen of the 4United States, residing at Lima, in the county of Allen and State of Ohio, haveinvented certain 'new and useful Improvements in Friction-Buffers, of which the following is a specification.

This invention relates to new and useful improvements in draw bars for railroad cars and it particularly ypertains to improvements in the friction buffers thereof.

The invention aims primarily to provide novel'` and efficient means for increasing the frictional 4resistance of the movable elements embodied in the buffer and at the same time to provide adevice Which shall effectually cushion all shocks.

The invention aims as a general object to provide a device oi the above type which shall be simple in; construction, inexpensive` to 'manufactura and practical and efficient in use.

g' ings the numeral 1 designates the cheek plates pro-v The detailed construction will appear in the course of the following description in which reference is had tothe accompanying drawings forming a part of this specification, like numerals designating like parts throughout the several views, wherein,

Figure 1 is a central 'longitudinal section partly in elevation of a friction buffer constructed in accordancewith my invention, Fig. `2 is a detailed longitudinal section of` a stationary barrel in which the movable parts Work, and Fig. 3 is an end elevation of said barrel. l

'Referring specifically to the accompanying drawvided upon the draft timbers and. from which the constituent elements of the invention are suspended.

The cheek plates 1 are provided adjacent their ends withangle stops 2 for restricting the movement of follower plates 3, 'the latter being carried by the strap or yoke secured to the end of the draw bar 5.

Disposed between the plates 3 is a barrel 6 illustrated in detail in Fig. 2 and comprising sections 7 engaged with one another against rotation by projecting flanges 8 arranged in spaced relation upon the adjacent inner ends of said sections, the flanges of one section intertting in the spa-ccs between the flanges of the opposing section.

The sections 7 are provided at their outer ends with oppositely disposed, laterally extending apertured lugs 9 which register with corresponding lugs in the opposing section and through which fastening bolts l0 are' projected in their registering relationior 4the purpose of maintaining said sections 7 engaged as described.'

The barrel an entirety is et' cylindrical shape and is provided atthe outer ends of its bore, in each of the sections 7, with spiral ribs 11 extending in spaced parallel relation from a point slightly short ofthe ends -o an enlargement of parts.

of each of said sections to a selected point within the interior thereof. The ribs 11 are co-extensive and have recesses or channels -12 therebetween, the sides of which are dened by the surfaces of said ribs, lthe latter being slightly curved as at 13 as is shown in Fig. 2. y Y

Movable friction buffers 14 are disposed within each end of the barrel 6. The buffers 14 are provided with spirally extending projections 15, severally co-extensive, corresponding in conformation, number, and

relation to the ribs ll. The buffer 14 per se comprises a circular plate and is designed to have movement with relation to the barrel 6. To this end the projections 15 Work in the channel 12 and for other purposes of the invention are of greater length than the ribs 11. It will therefore be readilyA apparentthat any movement of the-butter 14 with relation to the barrel 6 must be partially rotative as Well as reciprocative, the outward movement of said `buffers being restricted by the plates 3, the movement of which latter is in turn restricted by the stops 2, and the inward movement of the buffers 14 being restricted byl the outer edges of the ribs 11 engaging the inner surface of said buffers tageous embodiment is illustrated in Fig. 2 in which i.

bearing plates 16 are disposed adjacent to the free ends of the projectionsl. The bearing plates 1G are oi disk shape and of course have yieldable, resiliently controlled movement within the barrel 6. To this end means are interposed'between the plates 16 for cushioning the inward movement of the buffers 14, such means comprising a main expansive coil spring 17 and an auxiliary expansive coil spring 18, concentrically disposed within the spring 17 and exerting its force in an opposite direction to that of the spring 17 as will be readily understood.

It will be readily understood from the foregoing description that the provision of the projections 15 and their arrangement and relation with respect to the ribs l1 provides an increased frietional bearing surface for the buffer in its 4movement without the necessity The cushioning device serves to' absorb the initial shock and the frictional buffer serves to eliminate to a minimum degree" vibrations consequent` ,upon the direct and reactionary movements of the buffers 14.

While the elements herein shown and described are Well adapted to serve the functions set forth, it is obvious that various minor changes may be made in the proportions7r shapcl and arrangement of lthe several parts Without. departing rom theY spirit and vscope of the .in'feniion asv defined in the appendedelams.

Having fully described my invention lelaim:

1. device of the type ser. forth comprising a working el embodying interlollied stationary sections,y each of said sections being provided adjacent its outer ends with spared spil-n1 'axially exiending' projections having a parallel relation, -buli'ers arranged at the ends of said barrel and having resirieled movement :l.\:iall \v thereof, said buffer-,s each having' spared spiral axial projections movablyf inlerlil'jng 'in ille open .sp-.lees between said lrsi' named projeetions. followers within said barrel abutting the ends ol' said last named projections and cushioning,r springs interposed between said followers and bearing' 'rliereagaiust 2. A' device of the type set forth eom'prisiug a working barrel providedadjacent its ends with spaced spiral ribs, a buffer having restricted movement axially of said barrel and including a .solid headand axially vextending projections lhaving free spaces-therebetween, said projeciions being of greater length than said ribs and ntertittiugthe spaces therebetween,v followers bearing lagainst the y free ends o f said projeetions'and cushioning;l springsbeax- 

